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31 Roadster "chuffs" when shifting after it is warmed up

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  • 31 Roadster "chuffs" when shifting after it is warmed up

    I have a 1931 roadster which, for the most part, starts and runs great. However, after a bit of driving when it has warmed up, it begins to "chuff" (fire, fart, huff - not sure of the correct technical term) each time I shift. It isn't horrible or loud (not a backfire), but it seems like something that is likely slightly out of adjustment or that I'm not doing right with the choke or something. I'm not an experienced hand, having inherited this beauty from my father. Any suggestions are welcome. Thanks!

  • #2
    Of course many things can cause a driveability issue. You might want to put your location on your avatar as somebody here may be nearby to help. The first thing you would want to do is make sure your engine is set to specs, points, timing, carb base settings. We don't like changing parts out till things are properly diagnosed but a condenser can cause issues like this as well as the lower Distributor plate pig tail wire.
    I always confirm spark related issues using a spark tester. This can give you an idea if it's spark or fuel
    Even a non venting gas cap will cause problems with the gravity flow of the fuel
    Here is a thread from our tech area that goes over some of the basics, read through it all carefully!!

    https://www.vintagefordforum.com/for...-and-misc-tips

    Welcome to the site
    3 ~ Tudor's
    Henry Ford said
    "It's all nuts and bolts"


    Mitch's Auto Service ctr

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    • #3
      Did this problem happen with your father driving it ?

      Where are your settings now ? Spark/ Gav/ idle mixture ?

      How does it run other than the shifting issue ?

      Comment


      • #4
        Your first post Welcome to the VFF
        after you check what has neen stated above, check the exhaust manifold, down pipe connection. There may be some black exhaust residue at that connection indicating a exhaust leak!

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        • #5
          Like Mitch said check things before changing parts. Could be a lot of things. lean mixture, exhaust leak at down pipe, leaking intake, electrical problems. My bet would be small intake leak.

          Comment


          • #6
            My daily driver used to make a similar noise when shifting, it is when I would let off the gas and is a little chuff or poof sound as the engine slows. I would often wait on that sound as I passed through neutral as a sign of when to continue shifting. I thought it was normal. I don't run my current one on a road where I can do much shifting so I don't notice it just fooling around on a dirt road.

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            • #7
              Originally posted by Sunnybrook Farm View Post
              My daily driver used to make a similar noise when shifting, it is when I would let off the gas and is a little chuff or poof sound as the engine slows. I would often wait on that sound as I passed through neutral as a sign of when to continue shifting. I thought it was normal. I don't run my current one on a road where I can do much shifting so I don't notice it just fooling around on a dirt road.
              There you go......it was Henry's built in shift point indicator.

              Try opening your GAV half a turn and see if it goes away After a 2 minute warm up, I close my GAV.

              Comment


              • amccarl
                amccarl commented
                Editing a comment
                I don't think I ever noticed it when my dad was driving, but I was too enthralled by the experience to really pay much attention. I generally set the GAV about a 1/4 turn before starting, as per the Model A basics guide here: http://modelabasics.com/Starting%20&%20Driving.htm (which really saved me at first). I don't normally touch it after I start, but I will try playing with it.

            • #8
              amccarl, as the others have said sounds like a simple issue going on check out their suggestions don't start throwing parts at the car. Let us know what you find out.

              Comment

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